1. GENERAL The stack’s total length is 46.9m,bottom diameter is 6500mm,middle diameter is 4950mm,upper end diameter is 3410mm.The stack with two reduce parts, 9 platforms. The stack is delivered to the field in three pieces, one piece of the stack bottom body’s length is 21.35m (the first piece),one piece of the stack middle body’s is 21.35m(the second piece), one piece of the stack top body’s is 22m(the third piece). The connection method between the first piece and the second piece is by welding. Connection method between the second piece and the third piece is by bolting. 2. ERECTION sequence Support and fit-up the first piece and the second piece on the ground, keep the 0° at the up direction, align the two pieces in line and make sure longitudinal levelness. After alignment of the first piece with the second piece, install the platforms and ladders and then lift by Heavy lifting subcontactor. Alignment the third piece on ground and install top platform. Lifting the third piece of stack and use the 43m platform for alignment and bolting. 3. LAYOUT Plan for Stack Field Assembly Layout plan stack field assembly see attachment-1. Temporary support for fitting up the stack a. Temporary support 1 : the height is 220mm with one piece, four crossties, 220mm*160mm*3000mm,four wedges. b. Temporary support 5 & 6: the height is 500mm with two pieces ; the shape of “井” support is used with 15 pieces of crosstie, the crosstie’s dimension is 220mm*160mm*3000mm,on the up of the crosstie place four wedges. c. Temporary support 2,3 & 4: the height is 995mm with three pieces, fabricated by shaped steel. Details of the temporary support 2, 3 & 4 please see the attachment sketch. 4. RECEIVING inspection on the field for the stack Check three pieces of the stack’s orieniation deviation ,especially the third piece,check the flue gas inlet nozzle relatively location from the stack center line. b. Check three pieces of the stack’s length deviation,the max deviation ≤20mm. c. Check both end of each piece of the stack’s roundness deviation and circle length deviation.the max circle length deviation≤15mm, the max roundness deviation ≤50mm (the deviation = the max diameter- the min diameter) d. Check joint surface levelness and shell verticality of each pieces of the stack’s straight deviation. e. Check pre-welding parts on the stack body for the platforms and ladders. f. Check the connection flange of the first piece and the second piece aswell as the stack body ‘s straight deviation. 5. ASSEMBLY the first piece with the second piece of the stack. a. Check the roundness and circle deviation of the joint, evenly tack weld 12 eye -plates on the stack near the joint to fit-up and align the joints with evenly mismatch.3/6

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The Third Chemical Engineering Construction Company of China ( TCC)

Align and Adjust the stack body’s mismatch and the welding joint’s clearance, tack weld the joint after checking. c. Joint Welding: Root pass use electrode φ3.2mm, filling and cap weld using electrode φ3.2mm. Back gouging insde weld and then re-weld. d. NDE for the welding Joint. 6. INSTALL Platforms and Ladders First, install the support of the platforms, ensure all supports on the level and at righ position. b. Second, install platform, grating and ensure the right relatively location for the platform with the support as well as platforms with the shell of the stack. c. 3At last,install the ladders, ensure parallelism the ladders with the center line of the stack 7. FINAL Inspection Check the stack ‘s concentric deviation after connecting the first piece with the second piece. b. Check the welding joint and clean the joint surface. c. Check weld joints of ladder and clean any splash and slags. 8. ORGANIZATION CHART See attachment- 2 9. CONSTRUCTION Schedule See Attachment-3 a. a.